Bodies floated out to sea and thousands of residents camped out overnight Tuesday on a hillside above a devastated town in the western Solomon Islands after a tsunami that struck without warning washed away coastal villages, killing at least 13 people. The death toll was expected to rise.

A wall of water reportedly 30 feet high struck the island of Choiseul and swept a third of a mile inland, while smaller but still destructive waves surged ashore elsewhere in the western part of the impoverished archipelago, causing widespread damage and driving thousands from their homes.

Thirteen people were confirmed killed in the Solomons, and the toll was expected to rise as assessment teams made their way into the stricken zone, National Disaster Management Office spokesman Julian Makaa told Australian Broadcasting Corp. radio.

The station also reported the first deaths in neighboring Papua New Guinea, were a family of five was reportedly washed away.

Makaa said more than 900 homes were destroyed in the Solomons.

The tsunami was triggered by a magnitude 8.0 quake that struck shortly after 7:39 a.m. Monday six miles beneath the sea floor, about 25 miles from the western island of Gizo and 215 miles northwest of the Solomons’ capital, Honiara, the U.S. Geological Survey said.

The quake—the strongest in the Solomons in more than three decades—set off tsunami alarms from Tokyo to Hawaii and closed beaches along the east coast of Australia more than 1,250 miles away. Lifeguards with bullhorns yelled at surfers to get out of the water at Sydney’s famous Bondi Beach.

The danger passed quickly, but officials rejected suggestions they overreacted, adding that the emergency tested procedures put in place after the 2004 Indian Ocean disaster that left 230,000 dead or missing in a dozen countries.

Up to 4,000 people were camped on a hill behind Gizo (pronounced GEE-zoh), a town of about 7,000, said Alex Lokopio, premier of hard-hit Western Province. In all, at least 5,000 people were affected by the tsunami, Makaa said.

Many people were too scared to return to the coast amid more than two dozen aftershocks, including at least four of magnitude-6 or stronger.

Initial reports from other islands suggest similar or worse levels of damage, the Red Cross said. Roads were inaccessible and there was heavy damage to infrastructure, including phones and electricity, said Martin Blackgrove, the International Red Cross’ regional disaster management coordinator for the Pacific, based in Fiji.

Because of Gizo’s proximity to the quake’s epicenter, the tsunami struck before an alarm could be sounded.

“There wasn’t any warning—the warning was the earth tremors,” Lokopio told New Zealand’s National Radio. “It shook us very, very strongly and we were frightened, and all of a sudden the sea was rising up.”

Within five minutes, a wall of water up to 16 feet high plowed into the coast, inundating homes, businesses, a hospital, schools and two police stations, and dumping boats into streets in Gizo, a popular spot for diving, witnesses and officials said.

Outlying villages, where many houses are flimsy wooden structures, may have fared worse, based on scattered reports from residents with two-way radios.

“It was just a noise like an underground explosion,” Gizo resident Dorothy Parkinson told Australia’s Nine Network television. “The wave came almost instantaneously. Everything that was standing is flattened.”

Judith Kennedy said water “right up to your head” swept through town. Her father, dive shop owner Danny Kennedy, said Gizo was devastated when the wave subsided.

“There are boats in the middle of the road, buildings have completely collapsed and fallen down,” he told The Associated Press.

Alfred Maesulia, a spokesman for Prime Minister Manasseh Sogavare, told the Sydney Morning Herald that some coastal villages were struck by waves up to 30 feet tall, although most reported heights of between 9 and 15 feet.

“There are reports that some villages were completely washed away,” he told AP.

Maesulia said the death toll was expected to rise as the cleanup progressed.

“Some people were seen floating on the sea during the big waves but it was very difficult to go near them,” he told the AP. “The number at the moment is 13. It’s possible that number will increase, maybe double up or even more.”

“Sasamungga village is quite a big village. … It was reported that 300 houses were completely destroyed in that village alone.”

Sogavare declared a national state of emergency and held meetings with his impoverished country’s aid donors about getting help. “My heart goes out to all of you at this very trying time,” he said in an address to the nation.

Debris needed to be cleared before Gizo’s airfield could be fully operational, the Red Cross said.

Fresh water was in short supply in some areas, while temporary, localized food shortages have also been reported, it said. Some of the affected areas can only be reached by boat.

A damage assessment team flew over the tsunami zone late Monday, then reported back to the government in Honiara, National Disaster Management Office spokesman Julian Makaa said.

Helicopters made the first drops of tents, drinking water and other supplies to the crowd on the hill behind Gizo, said Peter Marshall, the Solomons’ deputy police commissioner. Flights were expected to resume Tuesday.

One boat carrying relief supplies left Honiara for Gizo, and at least three more were expected to go Tuesday, Makaa told the British Broadcasting Corp.

U.N. Secretary-General Ban Ki-moon said the United Nations had a humanitarian team ready to deploy to the Solomon Islands and offered assistance to the government, U.N. spokeswoman Michele Montas said in New York.

The Australian government pledged $1.6 million in emergency aid and said helicopters already in the Solomons as part of a multinational security mission had been made available for rescue and relief.

The International Federation of Red Cross and Red Crescent Societies said it was releasing $53,000 in initial aid to the national Red Cross.

The archipelago has more than 200 islands with a population of about 552,000 and lies on the Pacific Basin’s so-called “Ring of Fire,” an arc of volcanos and fault lines where quakes are frequent.

The quake occurred when the Australian tectonic plate suddenly dived beneath the Pacific plate, said David Wald of the USGS National Earthquake Information Center in Colorado.

“It would have been a much worse situation if the cities were heavily populated,” Wald said.

On July 21, 1975, a large tsunami hit Bougainville, killing an estimated 200 people, according to the U.S. Geological Survey and World Health Organization. That tsunami and a 1956 wind storm, which also killed 200, are the deadliest natural disasters to strike the nation.

The Solomon Islands has been rocked by several strong earthquakes in recent history. The region was hit by temblors of magnitudes 8 and 8.1 in 1971 and 7.3 in 2003.

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